Notice: file_put_contents(): Write of 21358 bytes failed with errno=28 No space left on device in /opt/frankenphp/design.onmedianet.com/app/src/Arsae/CacheManager.php on line 36

Warning: http_response_code(): Cannot set response code - headers already sent (output started at /opt/frankenphp/design.onmedianet.com/app/src/Arsae/CacheManager.php:36) in /opt/frankenphp/design.onmedianet.com/app/src/Models/Response.php on line 17

Warning: Cannot modify header information - headers already sent by (output started at /opt/frankenphp/design.onmedianet.com/app/src/Arsae/CacheManager.php:36) in /opt/frankenphp/design.onmedianet.com/app/src/Models/Response.php on line 20
Accessibility on the NLM Website Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Accessibility on the NLM Website

The National Library of Medicine (NLM) is making every effort to ensure that the information available on our website is accessible to all. If you use special adaptive equipment to access the web and experience problems using our site, please contact us. We will provide the information to you in an alternate format.

You may contact Customer Service through the NLM Support Center or by phone at (888) FIND-NLM (346-3656) or (301) 594-5983. Please provide the address (URL) of the page on which you need assistance, along with a description of the problem.

NLM also supports the provisions of the Americans with Disabilities Act by providing disabled researchers access to its buildings and collections located in its reading rooms. Learn more about the physical facilities, equipment provided for accessing the Library's collection, and assistance available from staff when visiting NLM.

NLM offers health information in other languages to individuals with limited English proficiency. For those who are blind and visually impaired, NLM has created a series of audio described videos covering a range of topics that illustrate activities in which NLM is involved.

Related Resources

Last Reviewed: November 5, 2021